Structural Concrete - Hassoun

520 Chapter 14 Retaining Walls
Table 14.4
Problem
Problem No. H h f
A B C L
a 12 1.00 2.0 1.0 4.0 7
b 14 1.50 2.0 1.5 4.5 8
c 15 1.50 2.0 1.5 4.5 8
d 16 1.50 3.0 1.5 4.5 9
e 17 1.50 3.0 1.5 4.5 9
f 18 1.75 3.0 1.75 5.25 10
g 19 1.75 3.0 1.75 5.25 10
h 20 2.00 3.0 2.0 6.0 11
i 21 2.00 3.5 2.0 6.5 12
j 22 2.00 3.5 2.0 6.5 12
Refer to Fig. 14.20. All dimensions are in feet.
Figure 14.20 Problem 14.3.
14.5 Repeat Problems 14.3e–h, assuming that the backfill slopes at 10 ∘ to the horizontal. (Add key if needed.)
14.6 For Problems 14.3e–h, determine the reinforcement required for the stem, heel, and toe, and choose
adequate bars and distribution. Use f c ′ = 3ksiandf y = 60 ksi.
14.7 Determine the dimensions of a cantilever retaining wall to support a bank of earth 16 ft high. Assume
that frost penetration depth is 4 ft. Check the safety of the retaining wall against overturning and sliding
only. Given: Weight of backfill = 120 pcf, angle of internal friction = 33 ∘ , coefficient of friction
between concrete and soil = 0.45, coefficient of friction between soil layers = 0.65, and allowable soil
pressure = 4 ksf. Use a 1.5 × 1.5-ft key if needed.
14.8 A complete design is required for the retaining wall shown in Fig. 14.21. The top of the backfill is to
be level without surcharge. Given: Weight of backfill soil = 110 pcf, angle of internal friction = 35 ∘ ,